Among the various types of soft bindings, material placed in a three ring binder is considered softbound. Some might consider it hard binding however, due to it’s low durability, it is generally considered soft binding.
February 2006, V5#2: Production Thursday, Jan 29 2009
Book Production and Electronic Magazine binder, binding, durability, hard binding, hardbinding, material, soft binding, softbinding, softbound, three ring, type 4:39 pm
Gregath Company, Inc. Blog 